Dynamo-electric machine.



W. G. WRIGHT. nYNAM'o ELECTRIC MACHINE.

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a: NE' R WJTNESSES .1 V To @i mw! W MAlfamy WILLIAM G. WRIGHT, DF NEWDUL'UTH, MINNESOTA.

DYNAMO-ELECTRIG MACHINE.

Specification of Letters Patent.

Application filed August 15, 1912. Serial N o. 715,272.

To all 'whom it may concern Be it known that I, `WILLIAM G. WRIGHT,

- a citizen of the United States, residing at New Duluth,.county of St.Louis, and State of Minnesota, have invented new and useful Improvementsin Dynamo-Electric Machines, of which the following is a specification.

My present invention relates to dynamo electric machines having astationary armature and a revolving field.

The principal objects of my invention are to provide a machine of thecharacter described, reducing the number of bearings to a minimum andavoiding moving conductors and sliding contacts, such as commutators andcollector rings; to provide a machine of the character described whichmayl be used for generating an alternating current to so disposeelements of the machine to particularly adapt it to meetl therequirements of high speed machinery, and, in general, to provide amachine which is simple in construction, efficient in action, andsusceptible of easy repair.

Other objects of my invention will appear in the following detaileddescription, in connection with the accompanying drawing forming a partof this specification, and in which drawing:

Figure 1 is a central vertical transverse sectional view through amachine embodying my invention. Fig. 2 is a front elevation of themachine, the elements appertaining to the field having been removed todisclose the details of construction, and the field and alternatingcurrent coil conductors vbeing diagrammatically represented.

Fig. 3 is an elevation of the stationary arv mature core and itssupport. Fig. 4 is a face view of one of the field disks.

Similar characters refer to similar parts throughout the views.

Suitable frame-work, which may include4 a bed-plate 5 and standards 6,surmounted thereon carry bearings 7 having axially.

alined bores. Gonsistent with an object of my invention, that is, topermit of high speed of the rotating parts of the machine, thesebearings are-preferably of the selfadjusting and self-lubricant feedtype.

Bearings 7 support a rotatable shaft 8 carrying two field disks 9 heldin spaced apart relation to each other by a field core l0. The disks 9and core 10 may be secured to shaft 8, to rotate therewith, as by a key12 entering complementary grooves in these four elements. iind itdesirable to rigidly connect the disks with the core 10 as by bolts 13,although it is evident that the disks and core may be cast integral,without departing from the spirit of my invention, the con struction asshown being to facilitate assemblage of the machine.

Each eld disk is provided with a plurality of radially extending poles11 which, in the assembled machine complement each other to aid inproviding a magnetic circuit Patented May 30, 1916.

for the field flux. Exteriorly to each disk 9, in order to protect thepoles l1, I provide an annulus 14 of non-magnetic mate-y rial, securedby screws 15, or 'any other suitable means may be provided to close thespace between the poles.

The armature is disposed intermediate the disks 9 and is stationarilymounted. To accomplish this, an annular frame 16, clearly shown in Fig.3 of the drawing, is rigidly mounted upon the bed-plate 5 and has boltedto its internal periphery an annular core 17, preferably built up oflaminated band iron and rela-tively wider than the said annular frame.Bolts 18 rigidly secure the armature core to frame 16, as clearly shownin Figs. 1 and 2 of the drawing. The frame 16, through the intermediacyof armaturev core 17 rigidly supports a field exciting coil 19 woundabout a spool 20 to partially fill it and encircling the field core 10.It is to be noted that said spool 20 does not contact in any manner withthe elements 9 or 10 and includes Hanges20 which engage the internalperiphery of armature core 17. The conductors of coil 19 are designatedby characters 21 and 22, as clearly shown in Fig. 2 of the drawing.

The ends of the poles 11 of each disk 9 are protected by an annulus 23one for each disk, supported, in a stationary manner, by the frame 16,through plates 24 and screws 25.

Each face of the armature core is provided with radial grooves 26 toaccommou date conductors as hereinafter described.

The grooves 26 in the armature core accommodate radially extendingportions 32a of alternating current coil conductors 32 while the otherportions 32b and 32c of said conductors are disposed laterally 4of theframe 16 and intermediate the flanges 20. respectively, as clearly shownin Fig. 1 of the drawings. Of coils 32 on each face of the armature corethere are a number equal to the number of poles on each held disk, or

VLthis may be alternated, as hereinafter noted.

The conductors 32 are connected in series and alternating currentconductors and 3a lead from these conductors 'I may connect the coils onthe one face of the armature core with those on the other face in seriesor multiple, to act in unison, or l may provide separate conductors,whereby separate currents are generated.

It is obvious that the machine may be constructed as disclosed in thedrawings, as a single phase alternator, as a two phase alternator or asa three phase alternator.

It will be readily understood that various modifications of' theconstruction may be made, such as Winding the machine with delta or Yconnections well known to those skilled in the art and attention is alsodireeted to the fact thatl the field core and poles may be of laminatedmaterial so as to reduce current consumption owing to the generation ofeddy currents in the magnetic circuit.

I claimz- 1. In a dynamo electric machine, the combination of' two setsof field poles rotatable about a common axis, a field core separatingsaid sets of' field poles, a spool about said core but not contactingtherewith, said spool including flanges in close proximity to and havingtheir pla-nes in parallelism to the planes of said sets of field poles,a field exciting coil about said spool but notJ filling the same, anannular armature core intermediate said sets of poles and into which thesaid spool fits with the said flanges ot' the latter engaging theinternal periphery of said annular core, said core having radial groovesopen to the space intermediate the said flanges, means for rigidlymounting said armature core. an alternating current coil conductoraccon'imodated by the said grooves of' said armature core and continuingexteriorly of' said field .coil and within the said flanges ot' the saidspool.

2. In a dynamo electric machine, the combination of' a stationary framehaving a circular opening, an annular armature core relatively widerthan said frame and disposed \vithin said opening thereof and in contactwith the internal periphery, said core having radial grooves,alternating current coil conductors havingr portions accommodatedwit-hin said grooves and portions exteriorly and interiorly of the corelthe portions exteriorly thereotl lying laterally of said frame,rotatable field poles at each side ot' said armature core. and meanscarried by said frame for inclosing those portions of said alternatingcurrent coil conductors exteriorly of said armature core and protectingthe ends of' said poles, substantially as and for the purpose set forth.

WILLIAM G. WRIGHT.

Witnesses: Y

M. E. JONES, Jr., RICHARD B. OWEN.

